1+1 Redundancy Mode Guidelines And Restrictions; 1+1 Redundancy Mode Limitations - Cisco WS-C2948G-GE-TX Configuration Manual

Chapter 28 Power Management
If you choose to use the 1+1 redundancy mode, the type and number of modules that are supported are
limited by the power that is available from a single power supply. To determine the power consumption
for each module in your chassis, see the
To use a 1+1 redundancy configuration, you must change the system configuration from the default 2+1
redundancy mode to 1+1 redundancy mode by entering the set power budget command. Enter the set
power budget 1 command to set the power budget to accommodate a 1+1 redundancy mode. In the 1+1
redundancy mode, the nonredundant power that is available to the system is the power of a single power
supply. The second power supply provides full redundancy.

1+1 Redundancy Mode Guidelines and Restrictions

This section describes the guidelines and restrictions for the 1+1 redundancy mode in the Catalyst 4006
switch:
•
•
•
•
•

1+1 Redundancy Mode Limitations

This section describes the 1+1 redundancy mode limitations for the Catalyst 4006 switch.
If you try to configure the switch to operate in 1+1 redundancy mode, and you have more modules that
are installed in the chassis than a single power supply can handle, the switch displays this message:
Insufficient power supplies for the specified configuration.
If you are already operating in 1+1 redundancy mode with a valid module configuration and you try to
insert additional modules that require more power than the single power supply provides, the switch
places the newly inserted module into reset mode and displays this message:
Module has been inserted
If you power down a chassis that has been operating in 1+1 redundancy mode with a valid module
configuration, and you insert a module or change the module configuration inappropriately and power
on the switch again, the module(s) in the chassis (at boot up) that require more power than is available,
are placed into reset mode.
These scenarios initiate the 5-minute evaluation countdown timer. When this timer runs out, the switch
tries to resolve this power limitation by evaluating the type and number of modules that are installed.
The evaluation process may require several cycles to stabilize the chassis' power usage.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide
78-15908-01
To compute the power requirements and verify that your system has enough power, add up the power
that is consumed by the supervisor engine, the fan tray, and the installed modules. See the
Consumption for Modules" section on page 28-9
A module in reset mode continues to draw power as long as it is installed in the chassis; however,
the module is not shown in the show module command output because the system considers it
removed.
A single power supply provides 400 W or 650 W. Two 400 W power supplies provide 750 W. Two
650 W power supplies supply only 750 W; this power supply cooling capacity restriction applies to
the Catalyst 4006 switch.
When considering the 1+1 redundancy mode, you must carefully plan the configuration of the
module power usage of your chassis. An incorrect configuration will disrupt your system during the
evaluation cycle. To avoid a disruption, ensure that your configuration is within the power limits, or
return to the default 2+1 redundancy configuration by installing a third power supply in your switch
and setting the power budget to 2+1 redundancy mode.
Enter the set power budget 2 command to set the power budget to the 2+1 redundancy mode.
and
Understanding How Power Management Works on the Catalyst 4006 Switch
"Power Consumption for Modules" section on page
for more information.
Insufficient power supplies operating
28-9.
"Power
.
—
Release 8.2GLX
28-7